7 Functions of XwAP

36.4633GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN) and Wireless Local Area Network (WLAN)Release 17TSXw application protocol (XwAP)

The XwAP protocol provides the following functions:

– Setting up the Xw. This function is used to exchange the necessary data for the eNB and the WT to set up the Xw interface and implicitly perform an Xw Reset.

– WT Configuration Update. This function allows updating of application level data needed for the eNB and the WT to interoperate correctly on the Xw interface.

– WLAN Status Reporting. This function allows the eNB to configure reporting of load-related information from the WT.

– LTE-WLAN Aggregation. This function allows the eNB to request a WT to provide radio resources for LWA operation for a certain UE while keeping responsibility for that UE.

– LTE-WLAN Radio Level Integration with IPsec Tunnel. This function allows the eNB to request a WT to provide tunnel resources for LWIP operation for a certain UE while keeping responsibility for that UE.

– Reporting of General Error Situations. This function allows reporting of general error situations, for which function specific error messages have not been defined.

– Resetting the Xw. This function is used to reset the Xw interface.

The mapping between the above functions and Xw EPs is shown in the table below.

Table 7-1: Mapping between XwAP functions and XwAP EPs

Function	Elementary Procedure(s)
WLAN Status Reporting	a) WT Status Reporting Initiation b) WT Status Reporting
Setting up the Xw	Xw Setup
WT Configuration Update	WT Configuration Update
LTE-WLAN Aggregation	a) WT Addition Preparation b) WT Association Confirmation c) eNB Initiated WT Modification d) WT Initiated WT Modification e) eNB Initiated WT Release f) WT Initiated WT Release
LTE-WLAN Radio Level Integration with IPsec Tunnel	a) LWIP Addition Preparation b) eNB Initiated LWIP Modification c) eNB Initiated LWIP Release d) WT Initiated LWIP Release
Reporting of General Error Situations	Error Indication
Resetting the Xw	Reset